Nio's preliminary data shows the company generated adjusted profit from operations during the fourth quarter -- but don't overlook the drawback to its operating margins.Over the past four months Nio (NIO 0.10%) has shed roughly 35% of its value, giving risk-tolerant investors an opportunity to scoop up shares of a promising Chinese electric vehicle (EV) maker. The great news for potential investors is that Nio is turning a corner and is about to post its first adjusted profit thanks to consistently improvin ...